 1991, Supreme Court Justice Thurgood Marshall, the first black jurist to stay on the nation's highest court, announced his retirement. 2005, BTK serial killer Dennis Rader pleaded guilty to 10 murders that had speared fear across Wichita, Kansas, beginning in the 1970s. 2006, a constitutional amendment to ban desecration of the American flag died in a Senate cliffhanger, only one vote short of the 67 needed to send it to the states for ratification.